Bleaching process



A form represented JULIUS A. ROTH, OF PHILADELPHIA, PENNSYLVANIA.

BLEAoHI'NG PaocEss.

Specication of Letters Patent No. 16,100, dated November 18, 1856.

To all whom 'it may concern:

Be it known that I, J. A. ROTH, of the city of Philadelphia and State of Pennsylvania, have invented a new and Improved Mode or Process of Bleaching Vegetable Fiber for Paper and Other Purposes; and I do hereby7 declare that the following is a full and exact description thereof, reference being had to the accompanying drawings and to letters of reference marked thereon. y

The nature of my improvement consists, 1st, in providing the bleaching vats, tanks or 'reservoirs in which the ibers are to be bleached with air pipes which are connected with a blowing machine in order to force atmospheric air into the liquid required for bleaching, and thereby creating a rapid action of the bleaching agents; 2nd, to regulate the temperature of` the liquid the air being heated before entering the bleaching liquid to such a degree as may be desired: 3rd, by the passagel of the air into and through the contents of the bleaching vats, a gentle agitation is produced and a constant change of the atmosphere surrounding the fibers, so as to promote the more direct and ready action of the chemicals throughout the mass of ibers, as well as to bring the free oxygen of the air thus introduced in constant or renewed contact with the bleachn agents whereby their action is greatly acilltated.

To enable others skilled in the art to make and use my invention I will proceed to describe its construction and operation.

I construct my bleaching vat in an oval by Figure I marked (A2x in the accompanying drawing but' whic may ,be also constructed in any other form or sha e. Fig. II represents a sectional view o the same.

I provide the lower part of the tank or vat with a second bottom B, B, which bottom is perforated by incisions c, c, c and is placed on the projections marked' d, d-ol, d, ilf the sides of the tank in Figs. I and II.

The blowing pipe through which the atmospheric air is introduced through the perforations e, e, e, mayenter the vat over lts rim or top or through its side directly and terminates in a well arranged coil between the two bottoms of the tank. This pipe is perforated so as to divide the introduced air or rather to distribute it equally through the entire surface of the bottom B, B, and it is still more generally disseminated by the perforations in the second bottom (B, B,) so as to permeate readily the entire contents of the vat.

The blowing machine and heating apparatus it is needless to describe as the well known fans and cylinders may be used for the irst and any of the heating processes for the latter.

The paper pulp or other liber to be bleached are placed in the tank or vat above the second bottom (B, B) and there immersed inthe bleaching agents, care being taken that the fibers to be bleached are equally diffused throughout the liquid.

What I claim as my invention and desire to secure by Letters Patent consists in- Aidi'ng the action of the usual bleaching agents, by the application of atmospheric air in the manner and for the purpose substantially as described.

J. A. ROTH.

Witnesses:

CHARLES D. FREEMAN, ROBERT W. JONES. 

